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Question: If f(x) = \| cos 2x \| then f ¢(p/4 + 0) is equal to...

If f(x) = | cos 2x | then f ¢(p/4 + 0) is equal to

A

2

B

0

C

–2

D

None

Answer

2

Explanation

Solution

f(x) = |cos 2x |

f¢ (p/4 + 0) = Rf¢(p/4)

= lim⁡h→0\lim _ { h \rightarrow 0 }

= lim⁡h→0\lim _ { h \rightarrow 0 }= 2